Derek groans and tightens his grip on Kalin's hips, bracing himself on his heels before thrusting up harder into Kalin. "All yours, baby. Yours to fucking ride whenever you want."
Derek sighs before gritting his teeth. "Please just...give me a minute baby. I'll be right back." He kisses Kalin's head softly before pulling away reluctantly.
After getting dressed and taking a deep breath to calm his agitation, Derek walks out to look for Kas.
Derek sighs softly and takes a seat, looking at Kas' homework. "Well, first step is look through your work and see if you might have miscalculated anything."
Derek laughs and ruffles Kas's hair. "Double check your calculation for right here and tell me whether or not that would turn this into a sine wave of cosine wave."
Derek snorts and pats Kas's shoulder. "There you go. Now, Papa and I are gonna relax in the room. If you struggle with another problem, look through every single possibility ad to why it would be wrong before asking for help, okay?"
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